Americans vastly overestimate how deep their divisions are. It's actually pretty normal for countries to have real, viable separatist movements within them, and the US is nowhere near that.
Quebec almost left Canada in 1995, Scotland almost left the UK in 2014, Germany was split into two separate countries for almost half of the 20th century, Korea is still two separate countries today, Catalan may or may not be part of Spain anymore (it's been a while since I checked), and nobody is even really sure how many Chinas there are.
If anything, what's remarkable about the United States is how united you are, despite being a large group of people spread out over an entire continent. The vast majority of Americans speak the same language, follow the same religion, and -- perhaps most importantly -- identify first and foremost as "Americans". The fact that some of you vote for the "Have you ever hated the poor?" party and some of you vote for the "Have you ever hated the poor, on weed?" party is far less significant than the terminally online crowd would have you believe.